fix pylint warning

ZanataArgParser.py

@@ -137,13 +137,14 @@ def parse_env(self, args=None):
         # type: (argparse.Namespace) -> dict
         """Parse environment"""
         result = {}
-        for env_name, env_data in self.env_def.iteritems():
+        for env_name in self.env_def:
+            env_data = self.env_def[env_name]
             env_value = os.environ.get(env_name)
             try:
                 if not ZanataArgParser.is_env_valid(
                         env_name, env_value, env_data, args):
                     continue
-            except AssertionError, e:  # NOQA
+            except AssertionError as e:
                 raise e
             if not env_value:
                 if env_data['required']:
@@ -160,6 +161,6 @@ def parse_all(self, args=None, namespace=None):
         """Parse arguments and environment"""
         result = self.parse_args(args, namespace)
         env_dict = self.parse_env(result)
-        for k, v in env_dict.iteritems():
+        for k, v in env_dict.iteritems():  # pylint: disable=no-member
             setattr(result, k, v)
         return result

ZanataFunctions.py

@@ -12,7 +12,7 @@
 import sys
 import urllib2  # noqa: F401 # pylint: disable=import-error
 import urlparse  # noqa: F401 # pylint: disable=import-error
-from ZanataArgParser import ZanataArgParser
+from ZanataArgParser import ZanataArgParser  # pylint: disable=import-error
 
 try:
     from typing import List, Any  # noqa: F401 # pylint: disable=unused-import

testZanataArgParser.py

@@ -14,7 +14,7 @@
 def _convert_unicode_str(dictionary):
     """Recursively converts dictionary keys to strings"""
     if not isinstance(dictionary, dict):
-        if isinstance(dictionary, unicode):  # NOQA
+        if isinstance(dictionary, unicode):    # NOQA  # pylint: disable=E0602
             return str(dictionary)
         return str(dictionary)
     return dict(
@@ -44,7 +44,7 @@ def _match_result(
         args = getattr(self.parser, method)(param_list)
         sys.stdout = sys.__stdout__
         if stdout_pattern:
-            self.assertRegexpMatches(
+            self.assertRegexpMatches(  # pylint: disable=W1505
                     captured_output.getvalue(), stdout_pattern)
         self.assertDictEqual(
                 _convert_unicode_str(expected_args),